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DT-670
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Specifications
 
 
Standard curve Curve DT-670

Recommended excitation 10 µA ±0.1%

Max reverse voltage 40 V

Max current before damage 1 mA continuous or 100 mA pulsed

Dissipation at recommended excitation 16 µW at 4.2 K; 10 µW at 77 K; 5 µW at 300 K

Thermal response time SD: typical <10 ms at 4.2 K, 100 ms at 77 K, 200 ms at 305 K;
BR: 1 ms at 4.2 K, 13 ms at 77 K, 20 ms at 305 K

Use in radiation
Recommended for use only in low level radiation – for more information click here

Use in magnetic field
Not recommended for use in magnetic field applications below 60 K. Low magnetic field dependence when used in fields up to 5 tesla above 60 K – for more information click here.

Reproducibility1 ±10 mK at 4.2 K

1 Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks from 305 K to 4.2 K
Range of Use
  Minimum
limit 		Maximum limit
DT-670-SD 1.4 K 500 K
DT-670-CU-HT 1.4 K 500 K
DT-670E-BR 1.4 K 500 K
DT-621-HR 1.4 K 325 K
Temperature Response Data Table
DT-670 DT-621-HR
V (volts) dV/dT (mV/K) V (volts) dV/dT (mV/K)
1.4 K 1.64 -12.5 — —
4.2 K 1.58 -31.6 1.678 -35
10 K 1.38 -26.8 — —
77 K 1.03 -1.73 1.03 -1.73
305 K 0.560 -2.30 0.560 -2.30
Click here for expanded response table
Calibrated Accuracy
Typical sensor accuracy2
1.4 K ±12 mK
4.2 K ±12 mK
10 K ±12 mK
77 K ±22 mK
300 K ±32 mK
500 K ±50 mK
2 [(Calibration uncertainty)2 + (reproducibility)2] 0.5 for more information see Appendices B, D, and E
Long-term Stability
Use to 305 K3 Use to 500 K 4
4.2 K ±10 mK ±40 mK
77 K ±40 mK ±100 mK
305 K ±25 mK ±50 mK
500 K — ±150 mK
3 Long-term stability data is obtained by subjecting sensor to 200 thermal shocks from 305 K to 77 K
4 Based on 670 h of baking at 500 K
Standard Curve DT-670
Tolerance Bands
2 K to
100 K
100 K to
305 K
305 K to
500 K
Band A ±0.25 K ±0.5 K ±0.5 K
Band A1 ±0.25 K ±1.5% of temp ±1.5% of temp
Band B ±0.5 K ±0.5 K ±0.33% of temp
Band B1 ±0.5 K ±1.5% of temp ±1.5% of temp
Band C ±1 K ±1 K ±0.50% of temp
30 K to
100 K
100 K to
305 K
305 K to
500 K
Band D5 ±0.25 K ±0.30 K ±0.10% of temp
Band E5 ±0.25 K ±0.25% of temp ±0.25% of temp
5For T < 30 K ±1.5 K
20 K to 325 K
DT-621 ±2.5 K or ±1.5% of temp, whichever is greater
Physical Specifications
Mass Lead
 type		 Lead polarity Sensor materials used
DT-670-SD
 37 mg 2 – nickel and gold plated Kovar Positive lead on right with package lip up and leads towards user Sapphire base with alumina body & lid. Molybdenum/manganese metallization on base and lid top with nickel and gold plating. Gold tin solder as hermetic seal
DT-670E-BR
(bare die) 		72.7 µg none Positive connection made through bottom of chip; negative connection made on base pad on top of chip Silicon chip with aluminum metallization on chip contacts
DT-621-HR
 23 mg 2 – platinum ribbon with tinned 60/40 SnPb solder Positive lead is right-hand ribbon with platinum disk down and leads towards user Sensing element is mounted to a platinum disk and covered with a dome of Stycast® 2850 epoxy
Typical Magnetic Field-Dependent Temperature Errors5 ΔT/T (%) at B (magnetic induction)
Package base parallel to field B
T (K) 1 T 2 T 3 T 4 T 5 T
4.2 -200 -300 -350 -400 -500
20 -10 -20 -25 -30 -40
40 -4 -6 -8 -10 -12
60 -0.5 -1 -2 -3 -3.5
80 < 0.1 -0.5 -0.8 -1.1 -1.5
300 < -0.1 < -0.1 < -0.1 < -0.1 < -0.1
Package base perpendicular to field B
T (K) 1 T 2 T 3 T 4 T 5 T
4.2 -8 -9 -11 -15 -20
20 -4 -5 -5 -5 -10
40 -1.5 -3 -4 -5 -5.5
60 -0.5 -0.7 -0.8 -1 -1.1
80 -0.1 -0.3 -0.5 -0.6 -0.7
300 < 0.1 0.2 0.5 0.6 0.6
5 To minimize magnetic field-induced temperature errors, the sensor should be oriented so that the package base is perpendicular to the magnetic field flux lines - this results in the diode current being parallel to the magnetic field
Click to Enlarge
Click to Enlarge
Click to Enlarge
    DT-670 Temperature Response Curve Curve DT-670 Tolerance Bands
Click to Enlarge Click to Enlarge
DT-670 Series Expanded Temperature Response Data Table
T
(K)		 Voltage
(V) 		dV/dT
(mV/K)
1.4 1.644290 -12.5
1.5 1.642990 -13.6
1.6 1.641570 -14.8
1.7 1.640030 -16.0
1.8 1.638370 -17.1
1.9 1.636600 -18.3
2.0 1.634720 -19.3
2.1 1.632740 -20.3
2.2 1.630670 -21.1
2.3 1.628520 -21.9
2.4 1.626290 -22.6
2.5 1.624000 -23.2
2.6 1.621660 -23.6
2.7 1.619280 -24.0
2.8 1.616870 -24.2
2.9 1.614450 -24.4
3.0 1.612000 -24.7
3.1 1.609510 -25.1
3.2 1.606970 -25.6
3.3 1.604380 -26.2
3.4 1.601730 -26.8
3.5 1.599020 -27.4
3.6 1.596260 -27.9
3.7 1.59344 -28.4
3.8 1.59057 -29.0
3.9 1.58764 -29.6
4.0 1.58465 -30.2
4.2 1.57848 -31.6
4.4 1.57202 -32.9
4.6 1.56533 -34.0
4.8 1.55845 -34.7
5.0 1.55145 -35.2
5.2 1.54436 -35.6
5.4 1.53721 -35.9
5.6 1.53000 -36.2
5.8 1.52273 -36.5
T
(K)		 Voltage
(V) 		dV/dT
(mV/K)
6.0 1.51541 -36.7
6.5 1.49698 -36.9
7.0 1.47868 -36.2
7.5 1.46086 -35.0
8.0 1.44374 -33.4
8.5 1.42747 -31.7
9.0 1.41207 -29.9
9.5 1.39751 -28.3
10.0 1.38373 -26.8
10.5 1.37065 -25.5
11.0 1.35820 -24.3
11.5 1.34632 -23.2
12.0 1.33499 -22.1
12.5 1.32416 -21.2
13.0 1.31381 -20.3
13.5 1.30390 -19.4
14.0 1.29439 -18.6
14.5 1.28526 -17.9
15.0 1.27645 -17.3
15.5 1.26794 -16.8
16.0 1.25967 -16.3
16.5 1.25161 -15.9
17.0 1.24372 -15.6
17.5 1.23596 -15.4
18.0 1.22830 -15.3
18.5 1.22070 -15.2
19.0 1.21311 -15.2
19.5 1.20548 -15.3
20.0 1.197748 -15.6
21.0 1.181548 -17.0
22.0 1.162797 -21.1
23.0 1.140817 -20.8
24.0 1.125923 -9.42
25.0 1.119448 -4.60
26.0 1.115658 -3.19
27.0 1.112810 -2.58
T
(K)		 Voltage
(V) 		dV/dT
(mV/K)
28.0 1.110421 -2.25
29.0 1.108261 -2.08
30.0 1.106244 -1.96
31.0 1.104324 -1.88
32.0 1.102476 -1.82
33.0 1.100681 -1.77
34.0 1.098930 -1.73
35.0 1.097216 -1.70
36.0 1.095534 -1.69
37.0 1.093878 -1.64
38.0 1.092244 -1.62
39.0 1.090627 -1.61
40.0 1.089024 -1.60
42.0 1.085842 -1.59
44.0 1.082669 -1.59
46.0 1.079492 -1.59
48.0 1.076303 -1.60
50.0 1.073099 -1.61
52.0 1.069881 -1.61
54.0 1.066650 -1.62
56.0 1.063403 -1.63
58.0 1.060141 -1.64
60.0 1.056862 -1.64
65.0 1.048584 -1.67
70.0 1.040183 -1.69
75.0 1.031651 -1.72
77.35 1.027594 -1.73
80.0 1.022984 -1.75
85.0 1.014181 -1.77
90.0 1.005244 -1.80
100.0 0.986974 -1.85
110.0 0.968209 -1.90
120.0 0.949000 -1.94
130.0 0.929390 -1.98
140.0 0.909416 -2.01
150.0 0.889114 -2.05
T
(K)		 Voltage
(V) 		dV/dT
(mV/K)
160.0 0.868518 -2.07
170.0 0.847659 -2.10
180.0 0.826560 -2.12
190.0 0.805242 -2.14
200.0 0.783720 -2.16
210.0 0.762007 -2.18
220.0 0.740115 -2.20
230.0 0.718054 -2.21
240.0 0.695834 -2.23
250.0 0.673462 -2.24
260.0 0.650949 -2.26
270.0 0.628302 -2.27
273.0 0.621141 -2.28
280.0 0.605528 -2.28
290.0 0.582637 -2.29
300.0 0.559639 -2.30
310.0 0.536542 -2.31
320.0 0.513361 -2.32
330.0 0.490106 -2.33
340.0 0.466760 -2.34
350.0 0.443371 -2.34
360.0 0.419960 -2.34
370.0 0.396503 -2.35
380.0 0.373002 -2.35
390.0 0.349453 -2.36
400.0 0.325839 -2.36
410.0 0.302161 -2.37
420.0 0.278416 -2.38
430.0 0.254592 -2.39
440.0 0.230697 -2.39
450.0 0.206758 -2.39
460.0 0.182832 -2.39
470.0 0.159010 -2.37
480.0 0.135480 -2.33
490.0 0.112553 -2.25
500.0 0.090681 -2.12